Finding the Fourth Proportional to 3,423.23, 5,139.10 and 3,407.43

Step by Step Solution

1. Step 1: Write the proportion equation
   3,423.23 : 5,139.10 = 3,407.43 : x
2. Step 2: Convert to fraction form
   3,423.23/5,139.10 = 3,407.43/x
3. Step 3: Cross multiply
   3,423.23x = 5,139.10 × 3,407.43
4. Step 4: Simplify right side
   3,423.23x = 17,511,127.88
5. Step 5: Solve for x
   x = 17,511,127.88/3,423.23
6. Step 6: Final answer
   x = 5,115.38